Grosjean and Mutsch lead the Vitaphone pair of Michael Bartels and Andrea Bertolini by twelve points.
Defending GT1 class race winner Enrique Bernoldi, who won the 2009 FIA GT event in a Corvette, is also part of the 2010 field with Vitaphone Maserati.
Following the previous round in Brno, performance balancing modifications were published by the FIA which affected four manufacturers.
Vitaphone Maserati drivers Michael Bartels and Andrea Bertolini earned their second consecutive pole position in FIA GT1 by setting a lap time over half a second faster than any other competitor in the third qualifying session.
Peter Kox and Christopher Haase gave Lamborghini their first front row start in FIA GT1 by taking second.